特点 Operating voltage: fSYS=4MHz: 2.2V~5.5V fSYS=8MHz: 3.3V~5.5V Multi-programmable Flash Type Program Memory From 13 to 23 Bidirectional I/O with Pull-high Options External Interrupt Input Full Timer Functions with Prescaler and Interrupt Timer External Input Crystal and RC System Oscillator Watchdog Timer Function PFD/Buzzer Driver Outputs Power Down and Wake-up Feature for Power Saving Operation Up to 0.5μs instruction cycle with 8MHz system clock at VDD=5V Bit Manipulation Instructions Table Read Function 63 Powerful Instructions All Instructions executed in 1 or 2 Machine Cycles Low Voltage Reset Function Programming Interface Full Suite of Supported Hardware and Software Tools Available